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Hi Bill,
I hope you don't mind that I cc'd this to techdiver.
> In a message dated 96-09-30 14:21:25 EDT, you write:
>
> << After hearing what soem of the USN
> guys had to say at this forum I just returned from, it sounds like that
> is a good idea. >>
> Would it be worth elaborating on this for us guppies that missed the forum?
> Probably would from my perspective,curiosity, interest, etc. :)
Not much of detail. One of the guys from the USN showed a table with
essentially the following:
PO2 Real-world experience
--- ---------------------
1.7 Number of serious operational incidents.
1.6 Several serious incidents with "mitigating circumstances"
(e.g. High breathing resistance, etc.)
1.5 No known incidents (Someone else later reported at least
one incident)
1.4 No effects with extreme exposure (2 examples of divers who were
inadvertently exposed to 55 hours at 1.4 over three days, with
pulmonary problems but no CNS problems).
1.3 Upper USN limit for routine mixed gas operations - but 10 cases
of "disturbed consciousness".
Like they say - if it's good enough for government.... Seriously,
though, this forum really nailed home for me the fact that the guys with
the REAL experience are the various military agencies, and they are the
ones we should listen to. They used to do a setpoint of 0.7, which I
would never follow because it would lead to unreasonable deco and doesn't
leave enough of a margin of error for hypoxia. 1.3 doesn't affect the
deco all that much, and provides some extra headroom for hyperoxia. I'll
run some profiles to see how it affects deco, but I'm now thinking that I
will run 1.3 for the bottom, and 1.4 for the deco.
Rich
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